Machine



(No Model.) 2 Sheets-Sheet 1.

F. G. LEEDER. SAND MOLDING MACHINE. No. 409,471. Patented Aug. 20, 1889.

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FRDERICK G. LEEDER, OF DALMUIR, COUNTY OF DUMBARTON, SCOTLAND.

SAND-MOLDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 409,471, dated August20, 1889.

Application tiled April 19, 1889. Serial No. 307,849. (No model.)Patented in England August 7, 1888, No. 11,868.

To all whom it may concern:

Be it known that I, FREDERICK GEone-E LEEDER, residing at Dahnuir,county of Dumbarton, Scotland, have invented a new and usefulImprovement in Sand-Molding Machines, which has not been patented in anycountry, except Great Britain by Letters Patent dated August 7, 1888,No. 11,368; and I do hereby declare that the following is a full, clear,and exact description of the inventiomwhich will enable others skilledin the manufacture or art to. which it relates to make and use the same.

This invention relates to machines for making sand molds for casting;and it has for its object to economize time and labor in making themolds, while enabling molds of simple kind to be produced in a completeform in a single machine, instead of, as heretofore, being composed ofparts made in separate machines or at separate operations in the samemachine.

In the improved machine the pattern is formed or fitted in part upon theLipper side and in part upon the lower side of a patternplate whichconstitutes a parting-plate, and the mold is formed in sand contained intwo flasks7 or mold-boxes placed one over and the other under thepattern-plate, the sand being pressed within the mold-boxes by theaction ot' hydraulic rams, which also serve upon the removal of thepattern -plate to eject the sand molds from the mold-boxes.

In the-accompanying drawings, Figure 1 is a vertical sectipn oi' themachine. Fig. 2 is a front elevation;v Fig. 3, an end elevation; Fig. 4,a plan, and Fig. 5 a horizontal section at the line a: Q0 in Fig. 8.

As represented in the drawings, the improved machine comprises a framingcomposed of a base-piece A, carrying two hydraulic rams B and C, two ormore vertical guide rods or pillars D D, and an entablature or top plateE, connected to the pillars D and serving to resist the pressure of therams when pressing the sand. The hydraulic rams (of which there may beone, two, or more pairs, according to the size of the machine) areplaced the one l5 within the other C, the plunger c of the outer one Cserving as a cylinder for the inner one B. The inner ram terminates atits upper end in a platen F, and on the outer ram is litted a head orplaten G', on which is fixed the lower iiask or mold-box G, to which theplateirF serves as a movable bottom plate.

The mold-boxes G and l-I are providedv with guide-brackets g and h,fitted to slide on the guide rods or pillars D D, and the patternplateI, which is situated between the upper and lower box, is centered orpivoted on one of the pillars D, or, as shown, on a separate pillar D',so that it may be swung horizontally out of the way or into positionbetween the mold-boxes for forming the mold. The lower mold-box isfilled with sand while the rams B O are down, a loose carrying board orplate being laid on the top of the platen F, and the pattern-plate swungout to the position .indicated at Fig. 5, the upper boxbeing lifted outof the way by means of chains j, attached to it and passing over pulleysJ on a rock-shaft K, provided with a lever-'handle L. The pattern-plateis then swung into the position indicated at Fig'. 3, between the boxes,and the upper box lowered onto it and iilled with sand. The rams arethereafter raised by operating-lever handles M N, which are fitted tococks m n on pipes m n,which admit water to the ram-cylinders B O. Themold-boxes G H and pattern-plate I, which is between' them, are by thismeans pressed up against the entablature E, while the platen Funderneath, and a central boss e in the entablature above, serve topress the sand against the pattern or patterns on both sides of thepatternplate I. The rams are then dropped by reversing the cocks m a bymeans of the levers M N, the lower mold-box G dropping with the head Gand platen F, while the upper box H is retained by a pawl p, engaging aratchet-wheel P on the rock-shaft K, ,and the pattern-plate I slips downto a mid-position, as shown in the drawings, in which itis clear of bothboxes G and H and maybe swung out orn the way. The upper box l-I is thenlowered by releasing the pawl p by means of a lever p', or the lower boxG raised to bring the parts of the mold together, and water admitted byopening the cock N to lift the inner ram B,whereby the platen F pressesup and ejects IOO the sand mold from the boxes G H,Which are slightlytapered to facilitate this operation, leaving the complete mold free onthe loose board or plate, ready for removal and casting.

The rams B C, in lieu of being actuated by water-pressure, may obviouslybe worked by means of steam, compressed air, or other fiuid underpressure. 1 v

Having now described the invention, what I desire to secure by LettersPatent isl. A sand-molding machine composed of the following elementsarranged and operating in combination, as follows: the framing A,carrying hydraulic rams B C, one placed within the other, a head on theram C, to which is attached a lower mold-box G, and a platen on the ramB, adapted to enter said mold-box, a pattern-plate I, fitted to swinghorizontally out or into position between the mold-box G and an uppermold-box H and to slide vertically in guides with said boxes, and aresisting` plate or entablature E, adapted t resist the pressure of therams upon sand compressed within the mold-boxes on both sides of thepattern-plate, substantially as described.

2, In a sand-molding machine, the framing A, carrying hydraulic rams BC, and a pressure-resisting plate E, in conjunction with the flasks ormold-boxes G H, iitted to slide on guides D D, the box G being carriedby the ram C, a pattern-plate I, adapted to be placed between saidboxes, and a platen carried by the ram B, substantially as described.

3. In a sand-molding machine, the combination of a pressure-resistingplate, the vertically-guided mold-boxes G I-I, a pattern-plate free tobe swung horizontally out or into position between said boxes and toslide vertically with the mold-boxes, and rams carrying one of saidmold-boxes and a compressingplaten, substantially as described.

4. In a sand-molding machine, the arrange ment, in combination, ofvapressure-resisting plate, the hydraulic rams B C, fitted one Within theother, one ram being provided with a platen fitted within a mold-boxcarried by the other ram and being adapted to eject from the box thesand-mold produced in the machine by the exertion of pressure of bothrams, substantially as described.

In witness whereof I have hereunto set my hand and seal this 27th day ofFebruary, 1889.

FREDERICK G. LEEDER. [L s] Witnesses:

WALLACE FAIRWEATHER, C'. E., Fel. Inst. Patent Agents, G2 St. VincentStreet, Glasgow.

THOMAS THOMSON, O'Zerk, 62 St. Vincent Street, Glasgow.

